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Chemical Equilibrium question

2012 · Q78
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Chemical Equilibrium question

2012 · Q78

NEETChemistryChemical EquilibriumMCQ+4 / −1
Given the reaction between 2 gases represented by A2 and B2 to give the compound AB(g),

A2(g) + B2(g) ⇌\rightleftharpoons⇌ 2AB(g)

At equilibrium, the concentration of
A2 = 3.0 ×\times× 10−-−3 M, of B2 = 4.2 ×\times× 10−-−3 M, of AB = 2.8 ×\times× 10−-−3 M
If the reaction takes place in a sealed vessel at 527oC, then the value of Kc will be
  1. A
    2.0
  2. B
    1.9
  3. C
    0.62
  4. D
    4.5
View written solutionFree

Correct answer: C

A2(g) + B2(g) ⇌\rightleftharpoons⇌ 2AB(g);

Kc = [AB]2[A2][B2]{{{{\left[ {AB} \right]}^2}} \over {\left[ {{A_2}} \right]\left[ {{B_2}} \right]}}[A2​][B2​][AB]2​

= (2.8×10−3)23×10−3×4.2×10−3{{{{\left( {2.8 \times {{10}^{ - 3}}} \right)}^2}} \over {3 \times {{10}^{ - 3}} \times 4.2 \times {{10}^{ - 3}}}}3×10−3×4.2×10−3(2.8×10−3)2​

= 0.62

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